HackingHealthcareHealthcareSupply Chain (3P Vendor)Business Associate (HIPAA)Customer Data InvolvedPHIHealth (basic)Identity (basic)LowContained

Health Services Agency

bd_67348f2bdea69711 · schema v1 · pii pii-v1

Severity

Low

Discovered

Dec 18, 2025

Filed

Jul 31, 2026

To disclose

32 weeks

Affected

Not disclosed

Confidence

65%

Full breach record for Health Services Agency →

Stanislaus County Health Services Agency reported a data breach involving protected health information (PHI) of its patients. The incident occurred at Aesto, LLC, a third-party vendor providing healthcare data migration and archiving services. Between December 2 and December 18, 2025, an unauthorized actor accessed PHI stored on Aesto's AWS infrastructure. The breach was discovered on December 18, 2025. Affected data includes full names and other health-related information. The agency notified the California Attorney General and affected individuals, offering identity theft protection services.

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California clockDiscovered Dec 18, 2025 → Notified Jul 10, 2026204d ✗ CA 60-day late32 weeks discovery → filing

Incident timeline

undetected · 16 days

discovery → filing · 32 weeks / 225 days

Dec 2, 2025

Begins

Dec 18, 2025

Discovered

Jul 31, 2026

Filed

vs. sector median

+20 wks slower

Tracked as a single-filing incident — the only disclosure on record for this event so far.ConfirmedView incident

Name: Health Services Agency
norm: health services agency
Domain: schsa.org

Name: Health Services Agency
norm: health services agency
Domain: schsa.org
Industry: Healthcarellm

Discovered: Dec 18, 2025
Breach occurred: Dec 2, 2025 – Dec 18, 2025
Undetected for: 16 daysoccurrence → discovery
Materiality determined: —
Notification sent: Jul 10, 2026
Affected individuals: Not disclosed
Data types: PHIHealth (basic)Identity (basic)
Attack vector: Unauthorized Access
MITRE ATT&CK: T1078 Valid Accounts
Threat actor: External
Regulator citations: Filed breach notification with California Attorney General
Third party: via Aesto, LLC

During the incident: Commenced a prompt and thorough investigation
Worked closely with external cybersecurity professionals
Conducted extensive forensic investigation and manual document review
Notified healthcare provider of the incident on July 10, 2026
Offering complimentary identity theft protection services
Changes made: Continually evaluate and modify practices and internal controls to enhance security and privacy
Source: Quoted from the filing itself, not independently verified.

Time to disclose: 32 weeks(225 days from discovery to filing)
Compliance flags: CA 60-day late · 204dCA AG copy >15d · 21d
Discovery-date grounding: letter-groundedThe discovery date is the detection date narrated in the notification letter — the defensible tier.
Clock breakdown: Statute Window Elapsed Threshold Status
California
Discovered: Dec 18, 2025
→ Notified: Jul 10, 2026
204d 60 days (analyst band, pre-2026 discoveries) CA 60-day late
California
Consumers notified: Jul 10, 2026
→ AG copy submitted: Jul 31, 2026
21d 15 calendar days CA AG copy >15d

Statute	Window	Elapsed	Threshold	Status
California	Discovered: Dec 18, 2025 → Notified: Jul 10, 2026	204d	60 days (analyst band, pre-2026 discoveries)	CA 60-day late
California	Consumers notified: Jul 10, 2026 → AG copy submitted: Jul 31, 2026	21d	15 calendar days	CA AG copy >15d

Status: No extraction artifact recorded for this disclosure.

Evidence ladder

Leak-site claim

Attacker assertion only. Establishes: claim date, group, alleged victim.

Press / market report

Unlocks: incident narrative, operational impact. Still no compliance clock.

State AG / regulator filingThis record

Unlocks: discovery date, data types, affected count, compliance clock.

SEC 8-K / victim statement

Unlocks: materiality, stated response, full audit trail. Ceiling removed.

Source URL: https://oag.ca.gov/ecrime/databreach/reports/sb24-627513
DisclosureLens links to the originating regulator URL — full filing bodies are not redistributed from public surfaces (§4.5).
Filed at: Jul 31, 2026
Raw hash: 64116dea02916078950c9eee1a5f8f87f8b7c5609db3593d925d6ddc6da1b20d

Reporting entityHealth Services Agency

Victim entityHealth Services Agency

Incidentdiscovered Dec 18, 2025

Stated responseCommenced a prompt and thorough investigation

ComplianceCA 60-day late

Extraction provenanceno artifact recorded

Source provenanceoag.ca.gov